Using Multiple Load BalancersI investigated that Google Chrome forces DNS invalidation and query to happen in case of 3sec timeout. Not sure other browsers behaviour though.

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My VPS crash durring high trafficIt is not clear what type of application do you have. Why to use Apache HTTPD and Nginx together? Can you use cache, if yes do you? Database configuration? Server setup (CPU, Memory, hard drive type and file system)? It is hard to believe Nginx crashes, very unlikely! Nginx error logs tells the problem with backend. How long an average request takes time?